package com.longqin.wechat.util;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

public class Global {
	
	/**
	 * 获取当前请求session
	 * @return
	 */
	public static HttpServletRequest getHttpServletRequest(){
		HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder
				.getRequestAttributes())
				.getRequest();
		return request;
	}	
	
	/**
	 * 获取当前请求session
	 * @return
	 */
	public static HttpSession getHttpSession(){
		return getHttpServletRequest().getSession();
	}
	
	/**获取请求的ip
	 * @return
	 */
	public static String getIP(){
		try {
			String ip=getIpAddr(getHttpServletRequest());
			return ip;
		} catch (Exception e) {
			return "获取ip失败";
		}
	}

	/**
	 * 获取当前网络ip(可以获取通过了Apache，Squid等反向代理软件的客户端的真实IP地址)
	 * 
	 * @param request
	 * @return
	 */
	private static String getIpAddr(HttpServletRequest request) {
		String ipAddress = request.getHeader("x-forwarded-for");
		if (ipAddress == null || ipAddress.length() == 0
				|| "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0
				|| "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0
				|| "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getRemoteAddr();
			if (ipAddress.equals("127.0.0.1")
					|| ipAddress.equals("0:0:0:0:0:0:0:1")) {
				// 根据网卡取本机配置的IP
				InetAddress inet = null;
				try {
					inet = InetAddress.getLocalHost();
				} catch (UnknownHostException e) {
					e.printStackTrace();
				}
				ipAddress = inet.getHostAddress();
			}
		}
		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
															// = 15
			if (ipAddress.indexOf(",") > 0) {
				ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
			}
		}
		return ipAddress;
	}
}
